Ooops, looks like Nokia's let slip that it's got another Windows Phone up its sleeve, and it looks like the rumored Ace — perhaps its true flagship. The video was quickly pulled, but not before someone made a copy.

Comparing screen sizes and the UI, estimates come in at a 4-inch display, but the phone obviously has a bit of Lumia 800 DNA in it. Let's hope this device really comes in and blows the socks off the competition. Don't get me wrong, the Lumia 800 is a fine device, but it's not awe-inspiring like a flagship should be. [YouTube via MyNokiaBlog via SlashGear via Gizmodo UK]